I once received a call from a customer who was determined he had a failing hard drive. The problem was that his computer wouldn't boot to Windows unless it tried three or four times in succession. His explanation was that this was because the hard drive wasn't "spinning far enough" to find the file it needed to boot. After each attempt, though, the hard drive would spin far enough over until finally it could find the file it needed to boot.
Needless to say, that wasn't it.